[DCShoes]

crossover cables should be available in any store that offers network equipment. just look for lan cables and make sure "crossover" is printed on the package.
you can also use the xbox link cable, since it is only a standard crossover cable!! the price shouldn't even be much higher than the one of a regular crossover cable...around 15 USD

watch out with the hub and router-stuff!!! crossover is only used to connect 2 networking (end) devices directly - if you need to go thru a hub, router or switch then you need to use a regular lan cable!!